Aug.18 -- Apple Inc. threatened to remove Epic Games Inc.’s developer account, cut off its developer tools and limit its ability to supply key graphics technology to other apps in the latest skirmish in a battle over app store fees. The iPhone maker’s plans were disclosed in a court filing by Epic on Monday. The developer has asked a California federal court to block Apple’s removal of the popular Epic game Fortnite from the App Store. Epic sued Apple last week over the move. Bloomberg Opinion columnist Alex Webb has the details on “Bloomberg Surveillance.” The views expressed are his own.